- AT stands for 3-Amino-1,2,4-Triazole (organic compound)
- AT stands for Abnormal Transient
- AT stands for Absolute Terror
- AT stands for Academically Talented
- AT stands for Accelerator Operations and Technology
- AT stands for Acceptance Tag
- AT stands for Acceptance Test
- AT stands for Acceptance Testing
- AT stands for Acceptance Trial
- AT stands for Acceptance Trials
- AT stands for Access Tandem
- AT stands for Access Time
- AT stands for Access Transport (Sprint)
- AT stands for Access Type
- AT stands for Accident du Travail (French: Work Accident)